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'" ,~ 001283 DQDHMX ELTIME ENDOF FLOOD FLOWHT FOFX FORCST GETFLO HYDRBAL therefore all demands are processed by OEM.) Subroutine DQDHMX is called when a shortage oc- curs, to rank upstream reservoirs that can poten- tially supply the needed water. The reservoirs are ranked in descending order by the size of the current surface area. This ensures that the reservoirs to be called upon are those that will lose the least head in meeting the need. Subroutine ELTlME computes the time in seconds used by the central processor since the last call to the subroutine. Subroutine ENDOF puts the data at the end of a specified month (usually Sept.) into locations l2, 24, etc. in the ZLIST array for TAPEDIT. Subroutine FLOOD distributes flood control re- leases from Lake Mead to CAP and MWD. Subroutine FLOWHT accumulates the salt mass and flow at selected points for computing a flow-weighted average of the salt concentrations at the end of each year. Function FOFX evaluates polynomial equations up to the fourth degree, given the coefficients and variable. Subroutine FORCST ~omputes the release and drawdown needed to accommodate the forecasted in- flow to Flaming Gorge, Blue Mesa, and Navajo Res- ervoirs. The forecasted inflow is based on a percentage of the actual inflow from the hydrol- ogy input file and a percentage of the average virgin inflow. These percentages change each month. The subroutine is called in months January through July. Subroutine GETFLO reads and accumulates hydrology data. At the beginning of each year, the subrou- tine reads and sums the total monthly inflows for months 4, 5, 6, or 7 through month 7 at reser- voirs for which a spring runoff prediction. is to be made. Subroutine HYDRBAL hydrologically balances the system each month. It processes all inflows, de- mands, reservoirs, and return flows. It calls other subroutines to locate and route water from reservoirs to meet deficits, if possible, or com- pute shortages, if not possible. 6